I got a camelback this season also, I use it for fresh COLD water and put additional water in my bottles sometimes mixed w/ a little powerade if it is going to be a long ride. I drink way more water when I have the camelback on.

We are pretty (VERY) rural and depending on the route there is no place to stop to refill. One day I did drain a 1.5 litre camelback, and almost 2 16 oz water bottles

Some roadies just think being cool is way better than being smart (I don't get the grief though about the camelback like I do about the "trunk")

keep on pedalling!
eclectic